add push/check CI

Author: bleggett

.github/workflows/buf-ci.yaml

@@ -0,0 +1,18 @@
+name: Buf CI
+on:
+  push:
+  pull_request:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+  delete:
+permissions:
+  contents: read
+  pull-requests: write
+jobs:
+  buf:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@6b42224f41ee5dfe5395e27c8b2746f1f9955030 # v4.2.0
+      - uses: bufbuild/buf-action@8f4a1456a0ab6a1eb80ba68e53832e6fcfacc16c # v1.3.0
+        with:
+          # Publishing schema changes to the BSR requires a BSR authentication token.
+          token: ${{ secrets.BUF_TOKEN }}